parse.cljs

(def game-score (js/Parse.Object.extend "GameScore"))

(def query (Query. js/Parse game-score))

(.get query "xWMyZ4YEGZ" #js {:success (fn [result] (prn result)) 
                              :error #(prn %2)})

parse.js

var GameScore = Parse.Object.extend("GameScore");
var query = new Parse.Query(GameScore);
query.get("xWMyZ4YEGZ", {
  success: function(gameScore) {
    // The object was retrieved successfully.
  },
  error: function(object, error) {
    // The object was not retrieved successfully.
    // error is a Parse.Error with an error code and message.
  }
});